Functions: GPS Course Return: Direction, distance, speed GPS course return selection Altimeter: Altimeter range(-700 to 9000m or -2296 to 29500ft), with 1m or feet accuracy. Max. or Min. memory for altitude. Altitude history and graphical display of the last 24 hour altitude readings. Altitude total gain or loss: 44999 meter or feet range. Sea level altitude setting. GPS distance, speed, erect ascending or descending rate, course return record. Barometer: Pressure range 300hpa to 1100hpa(8.84inHg to 32.44inHg) Resolution of 0.1hpa(0.01inHg) 24 hour pressure history and graphical display Electronic pressure weather forecast(sunny, slightly cloudy, cloudy, rainy) Pressure trend indicators Sea level air pressure setting. Compass: Direction Angle Thermometer: Range from -20 to 60 (-4 to 140) and selectable Max. or Min. memory for temperature Hygrometer: Relative humidity(20 percent - 95 percent ) Max. or Min. memory for relative humidity Time: Hour, minute, second Year, month, day, date Alarm clock Time zone setting Specifications: Material: Plastic Dimension: 10 x 6.5 x 2cm or 3.9 x 2.6 x 0.8in Weight: 75g or 2.6oz Package Size: 15.8 x 11 x 3.5cm or 6.2 x 4.3 x 1.4in Package Weight: 126g or 4.4oz Package List: 1 x Altimeter 1 x Charging Cable 1 x Wrist Strap 1 x Cleaning Cloth 1 x User Manual